Sawmill-carriage knee



' Dec. 2, 1924.

. 1,518,110 J.- s. REID SAW M ILL CARRIAGE KNEE Filed 0Ct.- 24, 1922 W A TT NEY.

Patented Bec.. 2, i924.

taai

earns JOSEPH S.- RED, OF CLEAN, NERE!" YORK, ASSIGNOR T CLARK BROTHER-S COMPANY, 0'35 CLEAN, NEX? YORK, A CORFORATIN OF NEW/V YORK.

SA'WIILL-CARRIAGE KNEE.

Application filed @ctobcr 24, 1922.

T0 ZZ fio/rom. 'it may ammira:

Be it known that l, .lossen S. Rino, a citizen of the United States, residing' at Olean, in the county of Cattaraugjus and State of New York, have invent-ed certain new and useful lmprovements in Sawmill- Carriage Knees, of which the following is a specification. y

This. invention relates to saw mill carriages and especially to the consti-notion of the knees of the carriage, the obiect being to provide means of adjustment between the knee. and feed screw adapted to actnato the knee.

ln sawinills whore very large logs are sawn, the knees of the log carraa'o are moved in and out by long screws located inside the knee base and engaging a nut fastened to the underside of the knee. These. screws are rotated by gears, usually mitre gears in connection with a shaft lengthwise of and at the rear of the log carriage which shaft is rotated in one direction to move the knee and the log outwards, and is rotated in the opposite direction to recede the knees: these motions being controlled by suitable mechanism called a set works. The screws are made of steel or iron and the nuts of a less hard metal, usually bronze, sometimes brass or a babbitte-d nut, and the knee screws usually have multiple threads.

rilhe threads of these knee nuts must wear somewhat rapidly and eventually `must be replaced by new nuts. In the meantime, because of the increasing,` looseness of the nuts, the knees are held less and less precisely and in consequence the timber is not sawn accurately. Also, the expense of new nuts is considerable and some. time and labor is required to remove the old nuts and place the new nuts. This expensive replacement of worn nuts is a constantly reoccurring necessity.

My invention provides means for read ily taking` up the wear of the knee nuts. I use two nuts at each knee, one the main nut, bears against the front side of the knee screw thread and therefore is the nut that forces Ahe knee forward (or outward) against. the resistance of the lon'. rlhe other nut, the auxiliary nut or recede nut, bears against. the rear side of the. knee screw thread and consequently is the nut that. pulls the knee to the roar of the carriage or,

Serial No. 596,541.

in sawmill parlance, recedes the knee. `When the carriage is new, both nuts may act. equally to move the knee in or out.` After wear of the threads of the nuts has occurred, the auxiliary nut is rotated slightly by the adjusting screws. The result of this rotation in the proper direction is to takeout any cndwise looseness of the knee nuts as a whole on the thread of the knee screw. rllhe thrust of the thread or threads of the. knee screw is revolved in the proper direction to move the knees and log` outward and the thrust of the thread or threads of the knee screw coming` against the thread or threads of the auxiliary nut, when the knee screw is revolved in the proper direction to move the knees inward. that is to recede.

The auxiliary nut is shown as adjusted and locked against undesired turning by 7 two screws, but different mechanical means may be employed, so that the two nuts can be rotated or turned with reference to one another and then locked against undesired turning. Also this type of sawmill carriage is sometimes used for resawing large pieces of timber called cants, and for other lumber manufacturing and wood working purposes.

ln the accompanying drawings:

Figure l. is a transverse sectional view through the sawmill carriage and knee actuating means; and

Fig'. 2 is a sec-tion on line 2 2 of Fig. l.

The numeral l indicates thecarriage mounted upon suitable trucks 2 adapted to travel upon the tracks lilounted to travel transversely of the carriage upon suitable ways l is the knee 5. rrrranged beneath the knee and transversely of the carriage is the knee feed screw G and the nui'neral 7 indicates a nut provided with internal threads to receive the feed screw 6. This nut is secured to the knee by bolts 8 8. The numeral 9 indicates an auxiliary nut arranged between the outer end of the knee and the end of the main nut 7. This auxiliary nut 9 is provided with a sleeve 10 received in the bearing' ll arranged in the outer end of the knee. lnternal threads l2 of the auxiliary nut 9 are slightly less in thickness than the width of the `groove of the screw threads on the feed screw G and adapted to bear against the rear side of thev feed. screw threads, the auxiliary nut con-` sequently beingthe nut that pulls the knee to the rear oft the carriage when the knee reeedes. Extending; upwardlyT from the nut is an arin 13 and arranged at the base ot' the knee are two transverse adjusd'inent screws M lli, the inner ends ot' which eentact with the arn'i 13. When it is desirable to take up the wear between the 't'eed screw and the n'iain threaded nut 7, the arn'i 13 is turned in the desiree lireetion and held in its adjusted position by means of the adjustiiient serews 'lei-wld, being locked in the adjusted position against turning); by the screws.

llt is obvious that other means may .be provided 'for holding the auxiliary nut in its adjusted position.

It will thus be seen that I have provided a ineans whereby the wear occasioned between the feed screw 3 and the main nut '1"' may be taken up readily thereby disposing' of the necessity ot renewingl these nuts at intervals, furthermore ei'ectingg; an accurate movement ot the knees insuring` an exact ino-veinent ot' the several knees used upon the carriage, thereby effecting n'iore accurate work ot the sawmill.

claiin:

rlhe combination of a log carriage knee, a feed screw, a stationary nut screwed thereon7 bolts for 'fastening` the stationary nut to the knee, a rotatable auxiliary nut arranged between the outer end of the knee and the stationary nut and abutting against the stationary nut, the nuts tending to push in opposite directions for taking up wear on the threads of the screw, the rotatable nut having' a sleeve received in a bearing' in the outer end ol the knee, an arni extending' npwardly from the rotatable nut, and adjusting screws in position to nieve` the arin for taking up wear on the feed serew.

ln testimony whereof I alii); iny signature.

JGSEPH S. RIGID. 

